I am using a 24 stepped ladder potentiometer using 1% tolerance resistors and the other day I checked the outputs (before soldering in) and it was perfect in both channels😉. on the other hand, I checked an Alps and Noble potentiometers and I measured a big difference between channels, like one channel measured 140 ohms and the other channel measured 147 ohms. sometimes it measured less and sometimes it measured way more. it was "never" matched to the other channel. I never knew it was a big difference from channel to channel. live and learn lol.
wow 20% is a lot 😱. The higher that I could read was a difference of 19 ohms between channels.🙁. Now I take Alps and Nobles out of my book 😡 unless they are 24 stepped ladder using 1% tolerance resistors 😉
Readings as low as 140 to 150 ohms suggest you were right at the bottom or top end of the rotation. That's around 0.4db error which is excellent for a pot at the extremes.
AFAIK about 0.3 dB is about the minimum you can detect when using headphones... speaker operation is less critical. Hence <1 dB matching is usually considered fine.
When using 4-gang pots, some manufacturers have added series resistors at the bottom of the first section so you don't get more channel imbalance than with a 2-gang pot.
When using 4-gang pots, some manufacturers have added series resistors at the bottom of the first section so you don't get more channel imbalance than with a 2-gang pot.
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